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The effect of fatigue on trunk muscle activation patterns and spine postures during simulated firefighting tasks

机译：模拟消防任务期间疲劳对躯干肌肉激活模式和脊柱姿势的影响

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摘要

The purpose of this study was to determine the effect of a fatiguing task (3 min intense stair climbing) on the adopted spinal postures and trunk muscular activation patterns during three highly physically demanding simulated firefighting tasks. Following the fatigue protocol, it was observed that individuals adopted significantly greater spinal flexion (16.3° maximum prior to fatigue as compared to 20.1° post fatigue) and displayed reduced abdominal muscle activation as compared to before the fatigue protocol (mean ranging from 16.6% maximum voluntary contraction (MVC) to 30.6% MVC prior to fatigue as compared to ranging from 14.6% MVC to 25.2% MVC post fatigue). The reduced abdominal activation may be due to a reduction in co-contraction during these tasks, which may compromise spinal stability. Reduced co-contraction combined with the increased spinal flexion may increase the risk of sustaining an injury to the low back.
机译：这项研究的目的是确定一项疲劳任务（3分钟的剧烈爬楼梯）对三项对身体有很高要求的模拟消防任务所采用的脊柱姿势和躯干肌肉激活模式的影响。疲劳方案后，观察到个体与疲劳方案前相比，脊柱屈曲明显更大（疲劳前最大16.3°，疲劳后最大20.1°），腹肌激活降低（平均最大16.6％）。自愿收缩（MVC）至疲劳前的MVC为30.6％，而疲劳后为14.6％MVC至25.2％。腹部活动的减少可能是由于这些任务期间共同收缩的减少，这可能会损害脊柱的稳定性。收缩不足和脊柱屈曲增加可能会增加腰部受伤的风险。

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